1) You can't go out in this weather unless you ______ thick clothing. a) wear b) don't wear c) will wear d) would wear 2) If you are interested in the underwater world, you ______ a marine biologist. a) would become b) should become c) became d) are becoming 3) The students ______ at the aquarium on time if they had taken the train. a) will have arrived b) would have arrived c) will arrive d) would arrive 4) Rainforests will continue to disappear if we ______ cutting down trees. a) don't stop b) aren't stopping c) wouldn't stop d) hadn't stopped 5) ______ your friend if he had asked you to? a) Will you help b) Had you helped c) Would you have helped d) You would have helped 6) The researchers ______ an important discovery if their research programme hadn't been stopped. a) might have made b) might make c) might be making d) might have been made 7) If there ______ a drought, people have to manage without enough water. a) is b) will be c) had been d) would be 8) 'How do I turn the machine off when I finish?' - 'If you press this button, it ______ working.' a) would stop b) had stopped c) would have stopped d) stops 9) If you ______ to your driving instructor, you won't be in any danger. a) listen b) are listening c) will listen d) listened 10) Unless we leave now, we ______ caught in the storm. a) won't get b) will get c) would get d) would have got 11) If we ______ to the weather forecast, we wouldn't have set sail this morning. a) had listened b) would listen c) would have listened d) listened 12) Would you still have played in the match if you ______ you'd lose? a) would know b) had known c) knew d) know 13) The lake ______ so polluted if it weren't for the factory. a) won't be b) wouldn't be c) wouldn't been d) isn't 14) We ______ if the coastguard hadn't arrived without delay. a) might drown b) would drown c) had drowned d) might have drowned 15) More and more dolphins ______ if we don't stop polluting the sea. a) would have died b) die c) will die d) would die

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